Answer:
In 2015 the three key events were
1. Refugee crisis roils Europe
2. Russia intervenes in Syria
3. The world strikes a deal for climate change
Explanation:
In 2015 the three key events were
1. Refugee crisis roils Europe
The Europe has always allowed refugees, the job market in Europe attracts residents of many countries especially refugees so they end up moving to Europe, and as a result of this the migrants pressure on Europe will still continue.
2. Russia intervenes in Syria
4 years civil war in Syria took a turn in September 2015 when Russia intervened in the civil war by conducting airstrikes from the Syrian airbase. Turkey was also involved in this matter when Russia used their airspace but the dispute was not resolved.
3. The world strikes a deal for climate change
The worlds climate is changing in a positive way but the experts have shown threats about getting a worse change of all times, Kyoto treaty 1992 failed to cut its carbon emission as promised in the treaty. For this reason nearly 195 countries gathered in Paris to ensure the cut in carbon emission in order to save the world.
